Her bump has come a long way since its debut just over a month ago.
But Sienna Miller is not letting her burgeoning tummy slow her down.
The expectant actress was snapped filming scenes for an advert on the streets of London, having jetted back from New York where she was shooting her new movie.
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Her rounded tum was clearly visible under a little white summer dress.
The 30-year-old is expecting her first child with boyfriend Tom Sturridge, who she has been dating for over a year.
And although she is keeping schtum on her little one’s due date, the actress told Vogue earlier this month that she had passed the three month mark.
"It's all progressing nicely and it’s very exciting," she said.
"I'm in my second trimester, so I'm I-can-talk-about-it-pregnant."
It's a little princess!